Ground stake



FIG. 1 is a perspective view of a ground stake showing my new design, the broken lines showing a lantern are for illustrative purposes only and forming no part of the claimed design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a side elevational view thereof;

FIG. 4 is a back elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view. 

The ornamental design for a ground stake, as shown and described. 